Model Boat Mayhem - Forum

Masterclasses => Blue Marlin - Heavy lift semi submersible ship => Topic started by: boatmadman on March 04, 2008, 06:32:38 PM

Title: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 04, 2008, 06:32:38 PM
Not sure where this should be - it going to be a semi submersible, so not a sub, but still a workboat. ;D

Anyway, here is the start of my latest attempt at shipmodelling.

The Blue Marlin was built for Dockwise. They sent me a lines diagram on an A4 sheet of paper for a 224m ship. With the help of a pantograph and plenty squinting I have made some progress.

This model is being built at 1:175 - odd scale I know, this makes it 1.28m x 0.36m so it should be relatively easy to move around.

The last 2 pics from wikipedia.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 14, 2008, 09:01:59 PM
Hi,
A little progress tonight, some more frames fitted, and started cutting out holes for tank balancing.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 27, 2008, 10:22:05 AM
I intend to coat with epoxy inside and out. Havent decided for sure yet, but I may do all the frames and tank dividers before starting planking.

Been doing more on the tankage, and trying to figure out where stuff will go - this is a bit of a headache!

Some more pics soon.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 27, 2008, 06:00:43 PM
Hi,

Well, been working away and thinking a lot. Got the tankage somewhere near how I think I need it.

However, I have realised that at this scale, there is only space for a 30mm prop. Now, my gut tells me that wont cope with this things weight and the fact it is flat bottomed with no keel, so, I have cut a new rear section of keel to allow for a prop up to 60mm, this will require some mods to the rear few frames, but so it goes.

The plus side is that this is now a free lance design!  O0

Ian

Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 02, 2008, 08:23:11 PM
Started planking today - it's gonna be a nightmare, lots of tight corners!

I am using a hot air blower to bend the planks this time - quick and easy, even get scorched fingers for my trouble!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 08, 2008, 08:51:28 PM
Some more planking progress, but it is sooo slow!

Been haviing trouble getting around the stern post, I must have broken 10 or 12 planks trying to get the bends. Tried heat (wet and dry heat), gentle persuasion, non gentle persuasion but all to no avail. >:(

So, I decided to leave it where I had got to and plank a straight piece from the bottom to under the transom with the intention of backfilling with plank sections - hope it works!

I even managed to punch a hole in one of the planks - doh! Not going to remove and refit another, I will fit a backing piece and fill the hole.

This IS a challenge!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 15, 2008, 10:26:26 AM
Its going slowly!

Got some more planking done, the hull shape makes it impossible to plank bow to stern in one length so I am having to plank in sections. Looks a mess at the moment, but they always do at this stage - well, mine do anyway!
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on May 01, 2008, 07:59:16 AM
Updates? - ok - well, no progress for a couple of weeks cos a cruise to Norway got in the way O0

Also, this week I got the sail for my 1:1 build, so I have spent some time rigging and sorting that out, nearly ready now so back to the Marlin soon.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on May 06, 2008, 02:09:12 PM
Here we are with an update - nothing spectacular, just more planking. Due to the curves at the bow, I am having to plank in 5mm strips at the moment - takes sooo long!

I have also fitted extra bulkheads in the tanks as I felt that more rigidity was needed given the weight of water it will have to move around.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on May 13, 2008, 08:25:52 PM
A little more progress on the planking.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on May 16, 2008, 07:10:05 PM
Its off the building board! WOO HOO O0

It will have to go back on though after some internal mods and strengthening!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 04, 2008, 08:46:02 PM
Progress at last!

Filling/sanding/filling/sanding carving balsa blocks, more filling/sanding - grrr I hate sanding!

At least now she has a pointy end it looks a bit more like it should  ;D

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 09, 2008, 09:14:32 PM
And here she is with one coat of epoxy and some lightweight cloth on her.

Also, you will see a hole and a dent - well, the hole is one of 4 in the hull for pumping ballast. The dent - thats another story, I dropped a G clamp on her!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 15, 2008, 04:08:46 PM
Righto, sanded down after the first coat of epoxy - hate this job, put on the second coat of epoxy. This time I used thin pieces of ply to scrape off the excess epoxy, its surprising how much came off! But after drying, the hull is significantly stronger than it was before.
 
Then more sanding, washing, sanding, washing etc and now its just about ready for a dust of paint to reveal all the lumps and bumps I have missed.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 17, 2008, 08:30:40 PM
Got the first primer coat on tonight, needs a bit more fettling to the hull, but its not too bad.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 20, 2008, 05:03:46 PM
Hi,

Yesterday I got all the ballast tanks coated in epoxy, I used fast glass from a well known motor supplies shop thinned with a little meths.

Then I did ballast tank volume and integrity trials.

My rough calculations indicated about 5l per tank, they turned out to be about 4.5l so I am happy with that.

There are a couple of places where there is a little leakage between tanks, but nothing major.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on June 20, 2008, 08:22:22 PM
Umi,

I only put water IN it, not it in the water!  ;D

Pumping arrangements will be revealed in due course - watch this space  O0

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on July 02, 2008, 12:40:23 PM
Floatation and Ballast test!

She floats and the pumps pump water in and out as required.  O0

Problem - the ballast tanks when full only bring her down to just above normal working level, so, additional ballast is required.

The bow thruster works although probably a bit too powerful on 12v.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 02, 2008, 08:11:20 AM
Hi,

Updates... well, been doing a little on separating the tanks and sealing the bow and stern sections, but, I was getting a bit bogged down with it for a while, so hadnt done much.

I decided to have a short break from it and do something different - a hydrofoil refurbishment.

Think I will be back to marlin with renewed vigour next week.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 06, 2008, 04:13:12 PM
I have never built a hull with so many holes in it......16 at the last count!!!! :o

2 for the bow thruster, 8 for the free flooding ballast tanks, 4 for the ballast pumps, 1 for the prop shaft and one for the rudder - hope I havent forgotten any!

I made brass flanges for each of the ballast holes and epoxied them in from the inside and outside.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 07, 2008, 04:03:15 PM
Went for more trials in the domestic test tank today - didnt get so far though, the free flooding tanks worked fine, but I had a couple of leaks between the free flooding and pumped ballast tanks, so trials aborted, hull now drying out before leak sealing with epoxy.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 14, 2008, 11:14:13 AM
well, after much pulling of hair out trying to find the source of and stop various leaks between tanks, I am now nearly bald, so, am off to Italy for a while to sit in the sun, drink wine, eat food and grow hair.

 O0 O0

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 26, 2008, 11:00:45 AM
Well that worked  O0

A week in the sun, home, another attempt at sealing the leaks and all is now sealed so I can get on with it again.

So, the moral of the story is:

When you come up against a problem that just wont sort out, go to Italy for a week in the sun, come home, try again and bingo....all is well

 O0

Ian (with some new hair growth)
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 26, 2008, 01:08:49 PM
Right then, just done another test tank run, determined I will need about 12 to 14 kg of lead ballast. So thats a step ahead.

BUT... 2 steps back  >>:-( I drowned the engineers!!! the engine room flooded, so thats the next job now - sort that out when it dries out.
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on August 28, 2008, 10:59:46 AM
Spent a while working out the steering arrangements.

The servo will live in a ballast tower connected by bowden cable to the rudder arms - why? this allows for the steering flat to free flood (avoids having to seal another compartment). Using the bowden cable allows the sheath to run from below the waterline when submerged to above the waterline thus avoiding any water ingress - well thats the theory anyway.

Pics show structure dry fitted.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 01, 2008, 08:07:37 PM
Got bored with working on tanks etc so I started on a ballast tower today. This one houses the steering servo and will (hopefully) keep water pout and allow access to the servo. More to be done on it yet.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 02, 2008, 05:50:51 PM
Today I have cut off the remaining build supports - trouble is, one was useful as a handle, ah well!

I have levelled the hull frames to allow a deck to lay flat and started working towards sealing the pumped ballast tanks.

I have lain a pce of MDF on the deck to give an idea of what she will look like, and, loaded 2 springers on bard!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 07, 2008, 07:44:47 PM
Marlin now has tank tops made for the pumped ballas tanks and engine rom.

The air vent pipes for the pumped ballast tanks are also now in place.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 07, 2008, 09:52:55 PM
The air vents are the clear silicone tubing held in place by the 'L' shaped bits of wood. The tube passes through the watertight bulkheads and exits to atmosphere.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 07, 2008, 10:02:00 PM
the two forward tank vents will go up through the forward structure and out the funnel, the two rear vents will find a way out somewhere - probably through a ballast tower.
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 17, 2008, 03:40:05 PM
Marlin has had a test in the new madboatworks test tank!

It all went quite well, a couple of small leaks on a tank cover to sort out.

And then I found water getting into the engine room and bows  >>:-( >>:-( >>:-(

Now, where the flippin 'eck is that coming from I muttered. I discovered it is coming down the cable conduit. Further investigation revealed that when drilling pilot holes for the tank cover screws, I drilled into the conduit in two places DOH! Fortunately, the cables werent in at that time, so no damage there. Anyway, an easy fix.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 23, 2008, 03:37:24 AM
No real progress at the mo, been working stupid hours.

But, been thinking about the superstructure and it will need lots of small windows cut in to it.

How do you all cut windows in plastic so they look neat, straight and regular, bearing in mind this thing is about 1:175 scale?

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on September 28, 2008, 12:15:55 PM
Bigford, might be worth investigating that idea, thanks.

Umi, I may be picking your brains soon for detailing at that scale.

Update:

Did a first submergance test last night - all went sort of until... put a small load on the deck, turned around to get my camera, turned back to find Marlin half way to a capsize!!! So, sorry no pics, will try again this week I hope.

I hadnt appreciated just how tender it would be when submerged, I havent put any stabilizing buoyancy in yet, I thought it would be ok in a flat calm test tank!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on October 02, 2008, 08:28:55 PM
Hi,

I tried the punch method and couldnt get consistently straight rectangular holes, also, i found I was having to straughten and re file the punch after 2 or 3 holes.

So, I went for the UMI method - 1 at a time! Took a while but I think its come out ok.

I have taped the bridge wings on just to give an idea of the dimensions of this thing.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on October 05, 2008, 07:03:08 PM
Good idea Andy. However I am putting blocks of foam in the outermost tanks to gain buoyancy - pics to follow eventually.

Meantime, some more work on the superstructure, and started on two cranes.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on October 15, 2008, 01:13:25 PM
Carried out sink and load trials this morning.

All went surprisingly well, I put her in the tank, filled the pumped ballast tanks, filled a plastic tool box with 4l water and placed it on the hull at midships.

I then added lead and foam to submerged load line draft and what seemed to be a reasonable amount of buoyancy (will need more trials on this before completion).

I then pumped out the tanks and  WOOHOO up she came, but not quite to the right waterline, so needs a little more work there.

Got a bit of a leak into the engine room to sort out, and the stbd ballast tower needs to be extended vertically.

Pictures below, sorry about the quality but the camera is playing up.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on October 15, 2008, 02:08:30 PM
As the extra's like drive motor, batteries (lots of) and electronics add to the weight of the bare hull, I wont need to add as much extra lead ballast in the tanks to get the right draft.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on October 30, 2008, 04:59:33 PM
Hi,

Having taken delivery of some action gizmo's, I thought I would spend the day on wiring and stuff.

In the pics you will see, 4 2 way switchers and one esc. The esc is for the bow thruster, the switchers for the ballast pumps. There is another esc, nor shown as it lives down aft for the main motor.

You will also see: 2 busbars, for power distribution, a fuse box - home made to accomodate action gizmo's, the row of sockets in the back of the pics are for plugging the gizmo's into the motors, enabling easy removal (I hope).

Still to squeeze into that space is an 8 channel rx plus battery and  a 3700ma battery to power pumps and bow thruster, oh and switches and charging sockets!

Ian

ps. I am still sorting out final positioning, they are only roughly laid out  :}
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on November 18, 2008, 12:37:16 PM
An update at last.

I have been doing some more on the wiring, I now have a control block, a right mess of wires and not much room to fit it all in.

All the switchers have been bench tested, next step is to install, connect and test tank.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on November 18, 2008, 08:12:57 PM
Have now finished the control block, and it fits - just! Not much room to spare, must have been made for the job :-))

Next, chuck it all in the test tank and check for correct rotation of the pumps. Later this week.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on December 13, 2008, 10:49:46 PM
Right then, having spent the last few weeks earning Brownie points - decorating - I will be back at Marlin within a couple of days.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 14, 2009, 04:38:13 PM
Well Santa and the family stopped that last attempt to re start, but today I got going.

Here we have the deck on, its 2mm styrene sheet. Some more sorting to do before painting yet.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 19, 2009, 04:45:00 PM
Done some detail work on the starboard ballast tower, some minor finishing off yet to do.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 21, 2009, 02:12:44 PM
Several hours hunched over the cutting mat has produced a little detail for the tops of the ballast towers and the foredeck.
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 27, 2009, 05:41:48 PM
And yet more time over the cutting mat produced this, think they are now ready for painting.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 29, 2009, 06:09:13 PM
I started on the detailing of the superstructure today - flippin fiddly!!

Some of the things look a bit wonky, but thats the camera! :-))

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on January 31, 2009, 03:34:16 PM
Last night I got the hull painted. It now needs to harden for a few days before getting a coat of satin varnish.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on February 05, 2009, 06:24:09 PM
I have made the lifeboat davits today.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on February 18, 2009, 04:42:49 PM
Here we have the ballast towers painted and finished.

And one of my dog - he's at that damn model again - I want a walk {:-{
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on February 18, 2009, 04:54:49 PM
Missed the doggo, here she is!
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 05, 2009, 09:01:11 PM
Here we have the superstructure painted and waiting for varnish and glazing.
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 20, 2009, 08:59:04 PM
A bit more progress on the detail work, here we have the superstructure varnished and glazed and fitted=to the hull. Also, the two cranes finished and loosely fitted.

Next jobs: rub down and paint the main deck, make lifeboats, varnish hull and stability trials!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on March 20, 2009, 10:00:51 PM
Thanks for the comments fellas.

The cranes are scratch - made up as I went along. Not too much detail on them though 'cos of the scale.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 09, 2009, 05:15:19 PM
Well, its finished! :-))

Or at least, the construction is, I still need to get it back in the test tank for ballasting trials.

However, having just completed and fitted the lifeboats (carved from a peice of cedar) its now ready for the local Easter show.

Pics of the show will appear in due course.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 19, 2009, 12:20:56 PM
First sea trials today!

I didnt do any submerging trials today as I havent got the stability properly sorted out yet, but running on open water seems to have been a success.
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 19, 2009, 01:50:18 PM
Yes it was running the bowthruster in the first pic.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on April 21, 2009, 04:51:45 PM
Surprisingly, that prop seems to be just about right. When starting up, quite a bit of prop wash until the boat gathers momentum and reduces as speed increases.

At full speed the model is over scale speed, but thats ok, better to have too much than not enough ok2

I was concerned that the prop size might be a problem, its got the biggest I could fit, 38mm 5 blade from Gsitek, but I was lucky!

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: boatmadman on May 04, 2009, 10:22:35 AM
Blue Marlin had her first open water submergence yesterday. The weather was a bit windy, raising what were large scale waves which made the operation a little difficult.

Conclusion is that submergence can only safely be done in flat calm conditions.

I have some pics, but they were taken at hi res and when compressed to a size for posting become unviewable. i will take some more at a later attempt.

Ian
Title: Re: Blue Marlin - Heavy lift semi submersible ship
Post by: Bunkerbarge on May 25, 2009, 02:36:33 AM
Please follow these links to a couple of video's of this amazing model in action:


http://www.youtube.com/watch?v=PywzZQM0MbQ

http://www.youtube.com/watch?v=Rg3CZLoVUxc